Google Threat Intelligence - Threat Hunting Hash

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Id	8f9cd0e5-b4ab-4821-95e2-1082fcd784c7
Rulename	Google Threat Intelligence - Threat Hunting Hash
Description	Google Threat Intelligence hash correlation.
Severity	Medium
Tactics	Execution
Techniques	T1059
Required data connectors	ThreatIntelligence
Kind	Scheduled
Query frequency	30m
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Google Threat Intelligence/Analytic Rules/ThreatHunting/ThreatHuntHash.yaml
Version	1.0.0
Arm template	8f9cd0e5-b4ab-4821-95e2-1082fcd784c7.json

KQL

let ioc_lookBack = 1d;
_Im_FileEvent
| where isnotempty(Hash)
| extend lowerHash=tolower(Hash)
| join kind=inner (
ThreatIntelIndicators
| where ObservableKey contains 'file:hashes'
| where isnotempty(ObservableValue)
| where SourceSystem == "Google Threat Intelligence"
| where TimeGenerated >= ago(ioc_lookBack)
| summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id
| where IsActive == true and (isnull(ValidUntil) or ValidUntil > now())
| extend lowerHash=tolower(ObservableValue)
) on lowerHash
| project Hash=ObservableValue, HashType=extract("file:hashes.('[^']*')", 1, ObservableKey), Description=Data.description, Type, TimeGenerated

YAML

incidentConfiguration:
  groupingConfiguration:
    lookbackDuration: 1h
    enabled: true
    reopenClosedIncident: false
    matchingMethod: AllEntities
  createIncident: true
id: 8f9cd0e5-b4ab-4821-95e2-1082fcd784c7
query: |
  let ioc_lookBack = 1d;
  _Im_FileEvent
  | where isnotempty(Hash)
  | extend lowerHash=tolower(Hash)
  | join kind=inner (
  ThreatIntelIndicators
  | where ObservableKey contains 'file:hashes'
  | where isnotempty(ObservableValue)
  | where SourceSystem == "Google Threat Intelligence"
  | where TimeGenerated >= ago(ioc_lookBack)
  | summarize LatestIndicatorTime = arg_max(TimeGenerated, *) by Id
  | where IsActive == true and (isnull(ValidUntil) or ValidUntil > now())
  | extend lowerHash=tolower(ObservableValue)
  ) on lowerHash
  | project Hash=ObservableValue, HashType=extract("file:hashes.('[^']*')", 1, ObservableKey), Description=Data.description, Type, TimeGenerated  
description: |
    'Google Threat Intelligence hash correlation.'
requiredDataConnectors:
- connectorId: ThreatIntelligence
  dataTypes:
  - ThreatIntelIndicators
alertDetailsOverride:
  alertDisplayNameFormat: Google Threat Intelligence Match
  alertDescriptionFormat: Correlation found from the {{Type}} table.
tactics:
- Execution
queryFrequency: 30m
queryPeriod: 1d
triggerOperator: gt
kind: Scheduled
name: Google Threat Intelligence - Threat Hunting Hash
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Google Threat Intelligence/Analytic Rules/ThreatHunting/ThreatHuntHash.yaml
version: 1.0.0
eventGroupingSettings:
  aggregationKind: AlertPerResult
relevantTechniques:
- T1059
severity: Medium
entityMappings:
- fieldMappings:
  - identifier: Value
    columnName: Hash
  - identifier: Algorithm
    columnName: HashType
  entityType: FileHash
triggerThreshold: 0

ARM